Le quintidi 25 fructidor, an CCXXIV, Andy Furniss a écrit : > Looking into this more with sysprof it seems with this test gstreamer is > twice as fast because it doesn't copy from shm but ffmpeg does. > > Of course I may be misunderstanding, but >90% load according to sysprof > is __memcpy_sse2_unaligned.
Can you detect what call to memcpy() in the ffmpeg code is responsible for this? I had an inkling that it was about the packet -> frame conversion, but it seems rawdec does the right thing in this particular case. Still, I suggest you add a quick debug av_log() in libavcodec/rawdec.c to check that need_copy is false. Also, did you have a look at my last mail on the topic: http://ffmpeg.org/pipermail/ffmpeg-devel/2016-September/199156.html about the speed difference between xcb and xlib? Regards, -- Nicolas George
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